Officials in Colorado watched — from afar — with interest as recreational marijuana stores made their first sales in Washington state Tuesday.

Shops in Colorado had a six-month head start on the Washington stores, and that meant Colorado cannabis regulators could offer advice to their counterparts in Washington. Andrew Freedman, the director of marijuana coordination for the Colorado governor’s office, said regulators gave guidance to Washington officials on dealing with edible marijuana products, banking issues and prevention of youth use.

“We have been in close contact with Washington throughout the process,” Freedman wrote in an e-mail.

No one from the Colorado Marijuana Enforcement Division went to Washington to watch sales, a division spokeswoman said.

The owners of Boulder’s Sterling University Peaks apartments, who this summer were cited for illegally subdividing 92 bedrooms in the complex, have reached an agreement to settle the case for $410,000, the city announced Thursday.